JP2019125562A - Battery cell temperature control device - Google Patents

Abstract

To provide a battery cell temperature control device capable of heating low temperature battery cells, in which a standby time till a stable output can be obtained from a battery can be reduced.SOLUTION: A battery cell temperature control device includes: a discharge resistor element Ba provided to each of a plurality of battery cells C1-Cn and generating heat by energization; temperature sensors T for obtaining temperatures of the respective battery cells C1-Cn; and a microcomputer M that energizes the discharge resistor elements Ba according to output values of the temperature sensors T. The microcomputer M calculates energizing periods, which bring the battery cells C1-Cn to a target temperature at a set time, to the discharge resistor elements Ba according to output values of the temperature sensors T.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery cell temperature control device.

  A battery mounted on a vehicle includes a plurality of battery cells connected in series. The output characteristics of each battery cell generally change depending on the battery cell temperature, and become unstable when the battery cell temperature is low. For this reason, the output characteristics of the battery itself are also not stable when the temperature of the battery cell is low. Therefore, it is preferable to adjust the temperature of the battery cell so that the output of the battery cell becomes stable before or while the vehicle is started to travel. For example, Patent Document 1 discloses a method for raising the temperature of a battery, which heats a battery cell before traveling by using a discharge resistance of a cell balance circuit.

JP, 2012-9407, A

  However, in the method disclosed in Patent Document 1, the discharge resistor is energized, heat is generated in the discharge resistor, and further, it takes a certain time until the battery cell is sufficiently heated. Furthermore, if the temperature rise rate differs depending on the battery cell, it is necessary to wait until the temperature at which all the battery cells become stable output, and the battery cell stabilized at the slowest temperature rise rate is stable until the battery is sufficiently heated. Output can not be obtained. Therefore, for example, in an electric car or the like not equipped with an internal combustion engine, it is difficult for the driver to stably drive the vehicle immediately after pressing the start switch of the vehicle.

  The present invention has been made in view of the above-mentioned problems, and in a battery cell temperature control apparatus capable of heating a low temperature battery cell, the standby time until a stable output can be obtained from the battery can be reduced. To aim.

  The present invention adopts the following configuration as means for solving the above-mentioned problems.

  A first invention is a battery cell temperature adjusting device, which is provided for each of a plurality of battery cells and generates a resistance element by heat, a temperature sensor for acquiring the temperature of the battery cell, and the above temperature sensor And a temperature rise control unit for energizing the resistance element in accordance with the output value of the temperature sensor, the temperature rise control unit causing the battery cell to attain the target temperature at the set time according to the output value of the temperature sensor. A configuration is employed in which the conduction period of the resistance element is calculated.

  According to a second aspect of the present invention, in the first aspect, the cell voltage detection unit for detecting the voltage of the battery cell is provided, and the temperature rise control unit charges the battery cell based on the detection value of the cell voltage detection unit. When the rate is higher than the threshold value, a configuration is adopted in which energization to the resistance element is performed.

  According to a third aspect of the present invention, in the first or second aspect, the cell voltage detection unit for detecting the voltage of the battery cell is provided, and the temperature rise control unit is responsive to the detection value of the cell voltage detection unit. A configuration is adopted in which the current supply period is corrected.

  A fourth invention is according to the third invention, wherein the temperature rise control unit corrects the conduction period so that the conduction period becomes longer as the detection value of the cell voltage detection unit becomes smaller. Adopt the configuration.

  A fifth invention according to any one of the first to fourth inventions, includes a plurality of temperature sensors, and the temperature rise control unit is a period during which the resistance element provided to the specific battery cell is energized. Is calculated according to the output value of the temperature sensor disposed closest to the specific battery cell.

  According to a sixth invention, in any one of the first to fifth inventions, a configuration is employed in which the temperature rise control unit performs setting of a new set time based on the set time in the past.

  According to the present invention, the temperature rise control unit calculates the conduction period to the resistance element so that the battery cell reaches the target temperature at the set time. In the present invention as described above, even when the temperature rise characteristics are different for each battery cell, it is possible to obtain the conduction period which becomes the target temperature at the setting time for each battery cell, and by setting the setting time in advance. For example, the occupant can start traveling of the vehicle without waiting for the heating of the battery cells. Therefore, according to the present invention, in the battery cell temperature control device capable of heating a low temperature battery cell, it is possible to reduce the waiting time until a stable output is obtained from the battery.

BRIEF DESCRIPTION OF THE DRAWINGS It is a system configuration | structure figure of the vehicle travel system containing the battery cell temperature control apparatus in one Embodiment of this invention. It is a flowchart for demonstrating the operation | movement of the battery cell temperature control apparatus in one Embodiment of this invention.

  Hereinafter, an embodiment of a battery cell temperature adjusting device according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each part is appropriately changed in order to make each part recognizable.

  FIG. 1 is a system configuration diagram of a vehicle travel system including a battery cell temperature adjustment device A of the present embodiment. The vehicle travel system shown in FIG. 1 is provided in a vehicle such as an electric car or a hybrid car that obtains a driving force for traveling by driving a motor with electric power, and as shown in FIG. A cell temperature adjustment device A, a contactor 1, a contactor 2, a battery ECU 3, a voltage detection unit 4, an inverter 5, and a motor 6 are provided.

  The battery X is a series connection of a plurality of battery modules x1 in which n battery cells C1 to Cn are connected in series. The plus terminal of the top battery cell C1 of the top battery module x1 is one output terminal The negative terminal of the lowermost battery cell Cn of the top battery module x1 is the other output terminal (minus output terminal).

  That is, the battery X is composed of a plurality of battery modules x1 connected in series in the following order: battery cell C1 → battery cell C2 → battery cell C3 → battery cell C4 → (not shown) → battery cell Cn, and each battery module x1 The total of the inter-terminal voltages of the battery cells C1 to Cn is an output voltage. Note that "n" is a natural number of 3 or more.

  Battery cell temperature adjustment device A is mounted on a printed circuit board of a predetermined size different from that of battery X, except for a part of discharge resistance Ba (resistance element) described later, and n battery cells C1 to Cn The voltage across terminals, that is, the difference between the potential of the plus terminal and the potential of the minus terminal is detected as cell voltages V1 to Vn, and the cell voltages V1 to Vn or the like are output to the battery ECU 3. The battery cell temperature adjustment device A includes n discharge circuits B1 to Bn, n + 1 transmission lines S1 to Sn + 1, n + 1 CR filters F1 to Fn + 1, n cell voltage detection units D1 to Dn, and a temperature sensor T And a microcomputer M (temperature rise control unit).

  In FIG. 1, only one battery module x1 is shown because of the restriction of drawing space, and only four battery cells C1 to C4 are shown among n battery cells C1 to Cn related to the battery module x1. . Moreover, although only one battery cell temperature control device A is shown in FIG. 1, the battery cell temperature control device A is provided for each battery module x1.

  Furthermore, in FIG. 1, n discharge circuits B1 to Bn, n + 1 transmission lines S1 to Sn + 1, n + 1 CR filters F1 to Fn + 1, and n cell voltage detection units for one battery cell temperature adjustment device A. Among D1 to Dn, voltages of four battery cells C1 to C4, four discharge circuits B1 to B4, five transmission lines S1 to S5, five CR filters F1 to F5, and four cell voltage detection Only parts D1 to D4 are shown. Moreover, although the battery cell temperature control apparatus A is equipped with several temperature sensor T, in FIG. 1, only one temperature sensor T is shown.

  The n discharge circuits B1 to Bn are provided corresponding to the n battery cells C1 to Cn, and connected in parallel to the battery cells C1 to Cn. Each of the n discharge circuits B1 to Bn is a series circuit of a discharge resistor Ba and a switching element Bb as illustrated. The discharge circuits B1 to Bn are discharged when the switching element Bb is turned on, and are not discharged when the switching element Bb is turned off. That is, discharge circuit B1 is connected in parallel to battery cell C1, discharge circuit B2 is connected in parallel to battery cell C2, discharge circuit B3 is connected in parallel to battery cell C3, and discharge circuit B4 is connected in parallel to battery cell C4. There is.

  The switching elements Bb of the discharge circuits B1 to Bn are, for example, collectively formed on one electronic substrate. On the other hand, the discharge resistors Ba of the discharge circuits B1 to Bn are formed apart from the electronic substrate and are disposed on the respective battery cells C1 to Cn. That is, the discharge resistance Ba is provided for each of the battery cells C1 to Cn. The discharge resistors Ba generate heat when energized, and heat the battery cells C1 to Cn.

  The n + 1 transmission lines S1 to Sn + 1 are wires for transmitting the terminal voltages of the terminals of the n battery cells C1 to Cn to the n + 1 CR filters F1 to Fn + 1, and each of the n battery cells C1 to Cn A terminal (total n + 1) and each input end (total n + 1) of n + 1 CR filters F1 to Fn + 1 are mutually connected.

  That is, transmission line S1 connects the positive terminal of battery cell C1 to the input end of CR filter F1, and transmission line S2 connects the negative terminal of battery cell C1 to the positive terminal of battery cell C2 and the input of CR filter F2. Connect with the end. Further, transmission line S3 connects the contact point between the negative terminal of battery cell C2 and the positive terminal of battery cell C3 to the input end of CR filter F3, and transmission line S4 connects the negative terminal of battery cell C3 and battery cell C4. The point of contact with the positive terminal of and the input end of the CR filter F4 are connected. Further, the transmission line S5 connects the contact point between the negative terminal of the battery cell C4 and the positive terminal of the battery cell C5 (not shown) to the input end of the CR filter F5.

  The n + 1 CR filters F1 to Fn + 1 are low-pass filters for noise removal provided on the n + 1 transmission lines S1 to Sn + 1, respectively, and include filter resistors and filter capacitors. The filter resistor is connected in series to each of n + 1 transmission lines S1 to Sn + 1, and the filter capacitor is connected to each of n + 1 transmission lines S1 to Sn + 1 at one end and GND (ground potential) at the other end. It is connected to the.

  That is, the input end of the CR filter F1 is connected to the transmission line S1, and the output end is connected to one input end of the cell voltage detection unit D1. The CR filter F2 has an input end connected to the transmission line S2, and an output end connected to the other input end of the cell voltage detection unit D1 and one input end of the cell voltage detection unit D2. The CR filter F3 has an input end connected to the transmission line S3, and an output end connected to the other input end of the cell voltage detection unit D2 and one input end of the cell voltage detection unit D3. The CR filter F4 has an input end connected to the transmission line S4, and an output end connected to the other input end of the cell voltage detection unit D3 and one input end of the cell voltage detection unit D4. The CR filter F5 has an input end connected to the transmission line S5, and an output end connected to the other input end of the cell voltage detection unit D4 and one input end 5a of the cell voltage detection unit D5 (not shown). There is.

  The n cell voltage detection units D1 to Dn are provided corresponding to the n battery cells C1 to Cn described above, and are input through the transmission lines S1 to Sn + 1 and the CR filters F1 to Fn + 1. Based on the terminal voltages of the battery cells C1 to Cn, the inter-terminal voltages of the battery cells C1 to Cn are detected as cell voltages V1 to Vn.

  That is, cell voltage detection unit D1 has the positive potential of battery cell C1 input to one input end through transmission line S1 and CR filter F1, and the other input input through transmission line S2 and CR filter F2. The difference with the negative potential of the battery cell C1 input to the input terminal is detected as the cell voltage V1. Cell voltage detection unit D2 has the positive potential of battery cell C2 input to one input end through transmission line S2 and CR filter F2, and the other input end input through transmission line S3 and CR filter F3. The difference with the negative potential of the battery cell C2 input to the is detected as the cell voltage V2.

  Further, cell voltage detection unit D3 has the positive potential of battery cell C3 input to one input end through transmission line S3 and CR filter F3, and the other input input through transmission line S4 and CR filter F4. The difference with the negative potential of the battery cell C3 input to the input terminal is detected as the cell voltage V3. Cell voltage detection unit D4 has the positive potential of battery cell C4 input to one input end through transmission line S4 and CR filter F4, and the other input end input through transmission line S5 and CR filter F5. The difference with the negative potential of the battery cell C4 input to the is detected as the cell voltage V4.

  The temperature sensor T is disposed in the vicinity of the battery cells C1 to Cn. For example, the temperature sensor T is disposed in the case of the battery module x1 in which the battery cells C1 to Cn are accommodated. A plurality of such temperature sensors T are discretely disposed in the case, and each is connected to the microcomputer M. These temperature sensors T detect the space temperature in which the battery cells C1 to Cn are installed, and output the detection result as a signal indicating the temperature of the battery cells C1 to Cn. When the microcomputer M calculates an energization period for raising the activation temperature of a specific battery cell C1 to Cn, an output value of a temperature sensor arranged closest to the specific battery cell C1 to Cn The energization period of the discharge resistance Ba is calculated according to For example, when raising the temperature of the battery cell C1 to the activation temperature, the microcomputer M determines the battery based on the output value of the temperature sensor T disposed closest to the battery cell C1 among the plurality of temperature sensors T. The energization period of the discharge resistor Ba disposed on the cell C1 is calculated.

  The microcomputer M is a so-called one-chip microcomputer in which a CPU (Central Processing Unit), a memory, an input / output interface and the like are integrally incorporated, and cell voltages V1 to Vn input from n cell voltage detection units D1 to Dn. Are subjected to A / D conversion to obtain sample values (cell voltages V1 to Vn), and the cell voltages V1 to Vn are output to the battery ECU 3.

  Further, in the present embodiment, the microcomputer M can store the driving start time (set time) preset by the occupant of the vehicle. The microcomputer M is connected to, for example, an input interface (not shown) installed in the vehicle compartment, and stores the operation start time input through the input interface.

  Further, the microcomputer M stores, as a target temperature, an activation temperature at which the activation of the battery cells C1 to Cn is increased and the output is stabilized. Generally, when the battery cell is at a low temperature, the output becomes unstable. The activation temperature is a temperature higher than the temperature at which the output of the battery cell becomes unstable, and is acquired in advance by experiment or simulation.

  Further, the microcomputer M is electrically connected to the temperature sensor T, and the temperature sensor T inputs signals of the temperatures of the battery cells C1 to Cn. The microcomputer M calculates an energization period for each discharge resistance Ba according to the output value of the temperature sensor T so that the battery cells C1 to Cn become active temperature at the operation start time, and calculates the energization period calculated Based on this, the switching element Bb is turned on.

  The microcomputer M calculates the charging rate of the battery cells C1 to Cn feeding the discharge resistance Ba based on the cell voltages V1 to Vn, and when the charging rate is equal to or less than a predetermined threshold value, the switching element Bb Does not turn on. That is, when the charging rate of the battery cells C1 to Cn based on the detection values of the cell voltage detection units D1 to Dn is higher than the threshold value, the microcomputer M energizes the discharge resistor Ba.

  Furthermore, the microcomputer M corrects the conduction period calculated as described above according to the cell voltages V1 to Vn (detection values of the cell voltage detection units D1 to Dn). More specifically, the microcomputer M corrects the conduction period so that the conduction period becomes longer as the cell voltages V1 to Vn become smaller than the predetermined reference voltage. Further, the microcomputer M corrects the conduction period so as to shorten the conduction period as the cell voltages V1 to Vn become larger than the predetermined reference voltage.

  Further, the microcomputer M executes balancing processing to equalize the cell voltages V1 to Vn of the battery cells C1 to Cn, as necessary. At this time, the microcomputer M discharges the battery cells C1 to Cn having high charge rates by the discharge circuits B1 to Bn, thereby achieving equalization of the cell voltages V1 to Vn. That is, in the present embodiment, the discharge circuits B1 to Bn can be used both as a balancing circuit for adjusting the cell balance and as a heating circuit for heating the battery cells C1 to Cn.

  The contactor 1 is an energization switch provided with an exciting coil and a pair of contacts that change to an open state or a closed state according to a state of power supply to the exciting coil, and one contact is connected to the positive output terminal of the battery X The other contact point is connected to the first input end of the inverter 5. The contactor 1 is set in the open or closed state by the drive current supplied from the battery ECU 3 to the exciting coil, thereby connecting / disconnecting the positive output terminal of the battery X and the first input terminal of the inverter 5. Switch.

  Similar to the contactor 1, the contactor 2 is an energization switch provided with an exciting coil and a pair of contacts that change to an open state or a closed state according to the power supply state to the exciter coil. The other contact is connected to the second input end of the inverter 5. The contactor 2 switches connection / disconnection between the negative output terminal of the battery X and the second input terminal of the inverter 5 by being set in the closed state or the open state by the drive current supplied from the battery ECU 3.

  The battery ECU 3 is a software control device that controls the contactor 1 and the contactor 2 based on a predetermined battery control program. The battery ECU 3 is a memory storing a battery control program, a CPU (Central Processing Unit) for executing the battery control program, and an input / output interface for exchanging signals with the microcomputer M, the contactor 1, the contactor 2 and the voltage detection unit 4 Etc.

  That is, the battery ECU 3 is a contactor based on various information related to the battery X input from the microcomputer M, the feed voltage from the battery X input from the voltage detection unit 4 and command information input from the upper control system not shown. 1 and a drive current for driving the contactor 2 are generated. By controlling the open / close state of the contactor 1 and the contactor 2 by the battery ECU 3, power supply / non-power supply from the battery X to the inverter 5 is set.

  The voltage detection unit 4 detects, as the battery voltage, the voltage of the feeding power supplied to the first input end and the second input end of the inverter 5 via the contactor 1 and the contactor 2. The voltage detection unit 4 outputs the battery voltage to the battery ECU 3 as one of control information.

  The inverter 5 is a three-phase inverter including a first input end, a second input end, and first to third output ends. The DC power from the battery X is input to the first input end and the second input end of the inverter 5. The inverter 5 converts the DC power of the battery X input to the first input end and the second input end into AC power (three-phase AC power) of a predetermined frequency and three phases (U phase, V phase, W phase) And outputs the three-phase AC power to the motor 6 from the first to third output terminals.

  The motor 6 is a three-phase motor that generates rotational power using three-phase AC power supplied from the inverter 5 as drive power. The vehicle travels using the rotational power generated by the motor 6 as a driving force for traveling. Such a motor 6 is, for example, a three-phase DC motor excellent in controllability.

  In the battery cell temperature adjusting device A according to this embodiment, the discharge resistance Ba, the temperature sensor T, and the microcomputer M adjust the temperature adjustment of the battery cells C1 to Cn in accordance with the set operation start time. Do.

  Next, the operation of the vehicle travel system in the present embodiment, particularly the temperature adjustment processing of the battery cells C1 to Cn performed by the microcomputer M, will be described in detail with reference to the flowchart of FIG.

  In the following description of the operation, in order to simplify the description, it is assumed that battery module x1 has a configuration in which 12 battery cells C1 to C12 are connected in series, and the first battery module C1 is close to battery cells C1 to C4. A temperature sensor T is disposed, a second temperature sensor T is disposed in proximity to the battery cells C5 to C8, and a third temperature sensor T is disposed in proximity to the battery cells C9 to C12. I assume.

  The microcomputer M performs temperature adjustment processing of the battery cells C1 to C4 according to the output value of the first temperature sensor T, and temperature adjustment processing of the battery cells C5 to C8 according to the output value of the second temperature sensor T. The temperature adjustment processing of the battery cells C9 to C12 according to the output value of the third temperature sensor T is performed in parallel or in time series. Since these temperature adjustment processes are similar processes, in the following description, the temperature adjustment process of the battery cells C1 to C4 corresponding to the output value of the first temperature sensor T will be described, and the second temperature sensor The description of the temperature adjustment process of the battery cells C5 to C8 according to the output value of T and the temperature adjustment process of the battery cells C9 to C12 according to the output value of the third temperature sensor T will be omitted.

  The microcomputer M executes the temperature adjustment process if the occupant sets the operation start time in advance by the past riding or by remote control. First, as shown in FIG. 2, the microcomputer M determines whether or not the temperature rise start time has passed (step S1). The temperature rise start time is a time that is a predetermined time before the driving start time set by the occupant. At the temperature rise start time, the battery cells C1 to C4 (battery cells C1 to C4 whose charge rate is higher than the threshold value) capable of energizing the discharge resistance Ba for the temperature rise operation start the operation start time from the temperature rise start time Battery cells C1 to C4 having a minimum temperature assumed (for example, a temperature assumed when the vehicle is placed in a very cold region) when the discharge resistance Ba is continuously energized until The temperature is set to be raised to the activation temperature. That is, when the discharge resistance Ba is continuously energized between the temperature rise start time and the operation start time, the battery cells C1 to C4 provided with the discharge resistance Ba surely rise to the activation temperature. The heating start time is set to be able to warm. When the temperature rise start time has not elapsed, the microcomputer M returns to step S1 again.

  If it is determined in step S1 that the temperature rise start time has elapsed, the microcomputer M determines whether the temperature of the battery cells C1 to C4 is equal to or less than the activation temperature (step S2). Here, the microcomputer M acquires the output value (temperature) of the first temperature sensor T which is the temperature sensor T closest to the battery cells C1 to C4 as the temperature of the battery cells C1 to C4, and It is determined whether or not the temperatures of the battery cells C1 to C4 are below the stored activation temperature. When it is determined in step S2 that the temperatures of the battery cells C1 to C4 are not equal to or lower than the activation temperature, the microcomputer M ends the temperature adjustment process.

  If it is determined in step S2 that the temperature of battery cells C1 to C4 is equal to or lower than the activation temperature, microcomputer M calculates a target temperature increase amount for each of battery cells C1 to C4 (step S3). . The target temperature rise amount is obtained as the difference between the activation temperature and the output value of the temperature sensor T.

  Subsequently, the microcomputer M sets an energization period for each of the discharge resistors Ba in a period up to the operation start time according to the target temperature increase amount obtained in step S3 (step S4). For example, the microcomputer M stores table data indicating the relationship between the target temperature rise amount and the current application period to the discharge resistor Ba, and the current application period is obtained by map processing using this table data.

  Subsequently, the microcomputer M acquires cell voltages V1 to V4 from the cell voltage detection units D1 to D4 (step S5). Further, the microcomputer M obtains a correction coefficient of the energization period set in step S4 based on the cell voltages V1 to V4 acquired in step S5 (step S6).

  Depending on the cell voltages of the battery cells C1 to C4, the magnitude of the current flowing through the discharge resistor Ba varies even in the same current supply period. For this reason, it is preferable to correct the energization period to the discharge resistor Ba according to the cell voltage (charging rate) of the battery cells C1 to C4. For example, the conduction period becomes short as the cell voltages V1 to Vn become larger than the predetermined reference voltage so that the conduction period becomes longer as the cell voltages V1 to Vn become smaller than the predetermined reference voltage. It is preferable to set a correction coefficient so that the current supply period is corrected by this correction coefficient. For example, the microcomputer M prestores table data indicating the relationship between the cell voltage of the battery cells C1 to C4 and the correction coefficient. At step S6, the microcomputer M obtains a correction coefficient for each discharge resistance Ba (energization period) based on each of the cell voltages V1 to V4. For example, the microcomputer M obtains a correction coefficient for the discharge resistance Ba provided for the battery cell C1 based on the cell voltage V1. When the charging rate of the battery cells C1 to C4 is not sufficient and is lower than a preset threshold value, the microcomputer M does not conduct electricity.

  Subsequently, the microcomputer M determines an energization period in which the discharge resistance Ba is actually energized based on the energization period set in step S4 and the correction coefficient obtained in step S6 (step S7). Then, the microcomputer M starts energization to the discharge resistor Ba (step S8), and continues heating the battery cells C1 to C4 until the battery cells C1 to C4 reach the activation temperature after the energization period elapses (step S9). . After the passage of the current application period, the microcomputer M stops the current application to the discharge resistor Ba to stop the temperature rise of the battery cells C1 to C4 (step S10).

  When the driver causes the vehicle to travel, when the driver turns on a start switch (not shown), the operation instruction is input to the battery ECU 3 through a communication system separately provided in the vehicle. Then, the battery ECU 3 changes the state of the contactor 1 and the contactor 2 from the open state to the closed state according to the operation instruction, thereby supplying the inverter 5 with DC power of the battery X.

  Then, the power supply from the battery X to the inverter 5 causes the inverter 5 to supply three-phase AC power to the motor 6, whereby the vehicle starts traveling. That is, in this vehicle travel system, the direct current power of the battery X is supplied to the inverter 5 by the contactor 1, the contactor 2 and the battery ECU 3 so that the vehicle can be traveled.

  According to the battery cell temperature adjusting device A of the present embodiment as described above, the microcomputer M calculates the conduction period to the discharge resistance Ba so that the battery cells C1 to C4 become active temperature at the operation start time. . Therefore, for example, even when the temperature rising characteristics are different for each of battery cells C1 to Cn, it is possible to obtain the conduction period at which the activation temperature becomes active for each of battery cells C1 to Cn, and wait for heating of battery cells C1 to Cn It becomes possible to start the stable running of the vehicle without a problem. As described above, according to the present embodiment, it is possible to reduce the standby time until the stable output is obtained from the battery X.

  Further, the battery cell temperature adjustment device A according to the present embodiment includes cell voltage detection units D1 to Dn that detect the voltages (cell voltages V1 to Vn) of the battery cells C1 to Cn, and the microcomputer M performs a cell voltage detection unit. When the charging rate of the battery cells C1 to Cn based on the detected values of D1 to Dn is higher than the threshold value, energization to the discharge resistor Ba is performed. Therefore, it is possible to prevent the battery cells C1 to Cn having a low charging rate from being forcibly discharged for heating the battery cells C1 to Cn, and to suppress the deterioration of the battery X.

  Further, the battery cell temperature adjustment device A of the present embodiment includes cell voltage detection units D1 to Dn that detect the voltages of the battery cells C1 to Cn, and the microcomputer M detects detection values of the cell voltage detection units D1 to Dn ( The energization period of the discharge resistor Ba is corrected according to the cell voltages V1 to Vn). For this reason, it can be set as the electricity supply period according to the voltage of battery cell C1-Cn, for example, it becomes possible to heat up all the battery cells C1-Cn equally.

  Further, in the battery cell temperature adjustment device A of the present embodiment, the microcomputer M applies a period during which the discharge resistance Ba is energized as the detected values (cell voltages V1 to Vn) of the cell voltage detection units D1 to Cn decrease. Correct the power-on period so that Therefore, even in the case where cell voltages V1 to Vn are lowered, battery cells C1 to Cn can be reliably heated up to the activation temperature by securing a long energization time.

  Further, the battery cell temperature adjustment device A according to the present embodiment includes the plurality of temperature sensors T, and the microcomputer M specifies the conduction period to the discharge resistance Ba provided for the specific battery cells C1 to Cn. The value is calculated according to the output value of the temperature sensor T disposed closest to the battery cells C1 to Cn. For this reason, according to the present invention, the temperatures of the respective battery cells C1 to Cn can be more accurately acquired, as compared with the case where the temperatures of all the battery cells C1 to Cn are acquired by one temperature sensor T. It becomes possible.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above embodiments. The shapes, combinations, and the like of the constituent members shown in the above-described embodiment are merely examples, and various changes can be made based on design requirements and the like without departing from the spirit of the present invention.

  For example, in the above embodiment, the configuration has been described in which the occupant of the vehicle performs the setting of the driving start time. However, the present invention is not limited to this. For example, the microcomputer M or the like may predict the next driving start time from the driving start time set in the past, and a new driving start time may be set based on the prediction. Alternatively, the time when the occupant turns on the start button of the vehicle may be accumulated, and the microcomputer M or the like may set the next driving start time based on the accumulation result. In such a case, it is not necessary for the occupant to set the operation start time every time.

  A: battery cell temperature adjustment device, Ba: discharge resistance (resistance element), C1 to Cn: battery cell, D1 to Dn: voltage detection unit, M: microcomputer (temperature increase control unit), T: Temperature sensor, X: Battery, X1: Battery module

Claims (6)

A resistive element provided for each of the plurality of battery cells and generating heat when energized;
A temperature sensor for acquiring the temperature of the battery cell;
A temperature rise control unit for energizing the resistance element in accordance with the output value of the temperature sensor;
The battery temperature adjustment device, wherein the temperature rise control unit calculates an energization period to the resistance element at which the battery cell reaches a target temperature at a set time according to an output value of the temperature sensor. A cell voltage detection unit that detects a voltage of the battery cell;
The temperature rise control unit executes energization to the resistance element when the charging rate of the battery cell based on the detection value of the cell voltage detection unit is higher than a threshold. Battery cell temperature regulator. A cell voltage detection unit that detects a voltage of the battery cell;
The battery temperature adjustment device according to claim 1 or 2, wherein the temperature rise control unit corrects the power supply period according to a detection value of the cell voltage detection unit.   4. The battery cell temperature according to claim 3, wherein the temperature rise control unit corrects the conduction period so that the conduction period becomes longer as the detection value of the cell voltage detection unit becomes smaller. Adjustment device. Equipped with multiple temperature sensors,
The temperature rise control unit is configured to set an energization period of the resistance element provided for a specific battery cell according to an output value of the temperature sensor disposed closest to the specific battery cell. The battery cell temperature control device according to any one of claims 1 to 4, which is calculated.   The battery temperature adjustment device according to any one of claims 1 to 5, wherein the temperature rise control unit sets a new set time based on the set time in the past.

Images